RTC I2C crash

[Cam]

Hi Paul,

Looks like we (Iain) found the other instability source which is detailed out here: http://www.forward.com.au/pfod/ArduinoProgramming/I2C_ClearBus/index.html

I'm wondering if its best to take care of this in the firmware RTC driver or simply in CoreBasic.... in which case might I ask what might the elegant code solution look like?

Cheers,

Cam

[Paul Curtis]

Do it in CB before installing and I2C device.

Looking at the description, this may work, it’s just a sketch — change SDA and SCL to the pins that you have connected as an I2C bus:

WAIT 2.5

PIN [SCL, SDA] AS INPUT 

IF PIN SCL = 0 THEN THROW -1 : rem can’t become master

I = 0

WHILE I < 0 AND PIN SDA = 0

  PIN SCL AS OUTPUT

  PIN SCL = 0 : WAIT 0.01

  PIN SCL = 1 : WAIT 0.01

  I = I + 1

WEND

IF PIN SDA = 0 THEN THROW -1

PIN SDA AS OUTPUT

PIN SDA = 0

WAIT 0.01

PIN SDA = 1

WAIT 0.01

PIN [SCL, SDA] AS INPUT

— Paul.

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[Cam]

Hi Paul,

 

Many thanks, as always a great help – testing now, fingers crossed.

 

Also, wondering if you have any plans to release a firmware update that includes some of the stuff you have been working on including the updated MCP322x driver?

 

Cheers,

 

Cam

[Paul Curtis]

Henry is working on it. 

--

Paul Curtis

[Cam]

Great news – thanks Paul, hopefully it will be ready soon?

[Paul Curtis]

I have no idea, I am in Germany for two weeks, in the Uk for a couple of days, and then back to Germany for two weeks.

Regards,

— Paul.

[Cam]

Hi Paul,

 

One more question, where can I read more about THROW and how to use it please, its not in the manual :-)

[Paul Curtis]

THROW terminates the application if not caught; you can possibly (I forget) use THROW with a TRY clause when the TRY calls a subroutine.  I used it only by way of example.

If it’s not documented, likely it doesn’t work in all cases.

— Paul.

[Cam]

OK, thanks Paul…. I will look at how this can work.

[Paul Curtis]

…or use a global and set it in a called function and don’t use THROW, use RETURN.

— Paul.

[Cam]

Guten Abend Paul – many thanks, I will use that approach.